单词 | square work |
释义 | > as lemmassquare work square work n. (see quots.). ΚΠ 1883 W. S. Gresley Gloss. Terms Coal Mining 233 Square work, an old system of working the Thick coal by getting the upper beds first and then the lower ones. 1883 W. S. Gresley Gloss. Terms Coal Mining 233 Square work, a system of working a seam of coal by cutting it up into square blocks or pillars. < as lemmas |
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